TH115 Floor Heating Thermostat Error Message: ER
There is a disconnection between the thermostat and the heating element. Be sure that you have a licensed electrician check to make sure that the thermostat is properly connected to the heating element. Also check to make sure that the sensor probe is properly attached and has not short-circuited.
NOTE: After checking the error messages and making sure that everything is in check and your system is still not working properly, your next step is to have a licensed electrician take your resistance readings with a digital multi-meter. Be sure that when those readings are taken, your heating element model number is available (you can gather this information from your box or reseller if you do not have the box) in order to make sure that the readings taken are on target. The electrician must know to take three readings: line to line and both ground readings. Once you have the results and the readings written down, along with the heating element model number, call Warmup so a representative can assist in diagnosing the issue.